ATMEGA16M1-MU Atmel, ATMEGA16M1-MU Datasheet - Page 236

• Manufacturer Part Number: ATMEGA16M1-MU
• Description: IC MCU AVR 16K FLASH 32VQFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA16M1-MU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: CAN, LIN, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 11x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -

21.8
236
Temperature Measurement
ATmega16M1/32M1/64M1
Example 2:
The temperature measurement is based on an on-chip temperature sensor that is coupled to a
single ended ADC input. MUX[4..0] bits in ADMUX register enables the temperature sensor. The
internal 2.56V voltage reference must also be selected for the ADC voltage reference source in
the temperature sensor measurement. When the temperature sensor is enabled, the ADC con-
verter can be used in single conversion mode to measure the voltage over the temperature
sensor.
As shown
when ADMUX value selects the temperature sensor as ADC input
Selection” on page 243.
two successive conversions are required. The correct temperature measurement will be the sec-
ond one.
One can also reduce this timing to one conversion by setting the ADMUX during the previous
conversion. Indeed the ADMUX can be programmed to select the temperature sensor just after
the beginning of the previous conversion start event and then the driver will be enabled 2 µS
before sampling and hold phase of temperature sensor measurement. See “Changing Channel
or Reference Selection” on page 228.
Figure 21-15. Temperature Sensor Block Diagram
– ADCL will thus read 0x00, and ADCH will read 0x9C
– ADMUX = 0xFB (ADC3 - ADC2, 1× gain, 2.56V reference, left adjusted result)
– Voltage on ADC3 is 300mV, voltage on ADC2 is 500mV
– ADCR = 512 × 1 × (300 - 500)/2560 = -41 = 0x029
– ADCL will thus read 0x40, and ADCH will read 0x0A
Writing zero to ADLAR right adjusts the result: ADCL = 0x70, ADCH = 0x02.
Writing zero to ADLAR right adjusts the result: ADCL = 0x00, ADCH = 0x29.
Figure
Temperature
Sensor
21-15, the temperature sensor is followed by a driver. This driver is enabled
The propagation delay of this driver is approximatively 2µS. Therefore
ADMUX = Temp. Sensor input
G=1
Enable when
ADC
Input
Multiplexer
ADMUX
See “ADC Input Channel
to sampling
and hold
8209D–AVR–11/10